/*****************************************************************************\
 *  gpu_generic.c - Support generic interface to a GPU.
 *****************************************************************************
 *  Copyright (C) 2019 SchedMD LLC
 *  Written by Danny Auble <da@schedmd.com>
 *
 *  This file is part of Slurm, a resource management program.
 *  For details, see <https://slurm.schedmd.com/>.
 *  Please also read the included file: DISCLAIMER.
 *
 *  Slurm is free software; you can redistribute it and/or modify it under
 *  the terms of the GNU General Public License as published by the Free
 *  Software Foundation; either version 2 of the License, or (at your option)
 *  any later version.
 *
 *  In addition, as a special exception, the copyright holders give permission
 *  to link the code of portions of this program with the OpenSSL library under
 *  certain conditions as described in each individual source file, and
 *  distribute linked combinations including the two. You must obey the GNU
 *  General Public License in all respects for all of the code used other than
 *  OpenSSL. If you modify file(s) with this exception, you may extend this
 *  exception to your version of the file(s), but you are not obligated to do
 *  so. If you do not wish to do so, delete this exception statement from your
 *  version.  If you delete this exception statement from all source files in
 *  the program, then also delete it here.
 *
 *  Slurm is distributed in the hope that it will be useful, but WITHOUT ANY
 *  WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 *  FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
 *  details.
 *
 *  You should have received a copy of the GNU General Public License along
 *  with Slurm; if not, write to the Free Software Foundation, Inc.,
 *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301  USA.
\*****************************************************************************/

#define _GNU_SOURCE

#include "src/common/slurm_xlator.h"
#include "src/interfaces/gpu.h"
#include "src/interfaces/gres.h"
#include "src/common/log.h"

/*
 * These variables are required by the generic plugin interface.  If they
 * are not found in the plugin, the plugin loader will ignore it.
 *
 * plugin_name - A string giving a human-readable description of the
 * plugin.  There is no maximum length, but the symbol must refer to
 * a valid string.
 *
 * plugin_type - A string suggesting the type of the plugin or its
 * applicability to a particular form of data or method of data handling.
 * If the low-level plugin API is used, the contents of this string are
 * unimportant and may be anything.  Slurm uses the higher-level plugin
 * interface which requires this string to be of the form
 *
 *	<application>/<method>
 *
 * where <application> is a description of the intended application of
 * the plugin (e.g., "auth" for Slurm authentication) and <method> is a
 * description of how this plugin satisfies that application.  Slurm will
 * only load authentication plugins if the plugin_type string has a prefix
 * of "auth/".
 *
 * plugin_version - an unsigned 32-bit integer containing the Slurm version
 * (major.minor.micro combined into a single number).
 */
const char plugin_name[] = "GPU Generic plugin";
const char	plugin_type[]		= "gpu/generic";
const uint32_t	plugin_version		= SLURM_VERSION_NUMBER;

extern int init(void)
{
	debug("%s: %s loaded", __func__, plugin_name);

	return SLURM_SUCCESS;
}

extern int fini(void)
{
	debug("%s: unloading %s", __func__, plugin_name);

	return SLURM_SUCCESS;
}

extern int gpu_p_reconfig(void)
{
	return SLURM_SUCCESS;
}


extern List gpu_p_get_system_gpu_list(node_config_load_t *node_config)
{
	return NULL;
}

extern void gpu_p_step_hardware_init(bitstr_t *usable_gpus, char *tres_freq)
{
	xassert(tres_freq);
	xassert(usable_gpus);

	if (!usable_gpus)
		return;		/* Job allocated no GPUs */
	if (!tres_freq)
		return;		/* No TRES frequency spec */

	if (!strstr(tres_freq, "gpu:"))
		return;		/* No GPU frequency spec */

	fprintf(stderr, "GpuFreq=control_disabled\n");
}

extern void gpu_p_step_hardware_fini(void)
{
	return;
}

extern char *gpu_p_test_cpu_conv(char *cpu_range)
{
	return NULL;
}

extern int gpu_p_energy_read(uint32_t dv_ind, gpu_status_t *gpu)
{
	return SLURM_SUCCESS;
}

extern void gpu_p_get_device_count(unsigned int *device_count)
{
	return;
}

extern int gpu_p_usage_read(pid_t pid, acct_gather_data_t *data)
{
	return SLURM_SUCCESS;
}
